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2 years ago

Is it possible for somebody to help me with a worksheet I will do that Brainly thing please

Mathematics

1 answer:

aleksandrvk [35]2 years ago

5 0

Yes send me a message!

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Write an expression that can be used to check the quotient of 646 ÷ 3

Ipatiy [6.2K]

646/3=x
To check it: x*3 should =646

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3 years ago

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Ten engineering schools in the United States were surveyed. The sample contained 250 electrical engineers, 80 being women; 175 c

steposvetlana [31]

Answer:

There is a significant difference between the two proportions.

Step-by-step explanation:

The (1 - <em>α</em>)% confidence interval for difference between population proportions is:

$CI=(\hat p_{1}-\hat p_{2})\pm z_{\alpha/2}\times\sqrt{\frac{\hat p_{1}(1-\hat p_{1})}{n_{1}}+\frac{\hat p_{2}(1-\hat p_{2})}{n_{2}}}$

Compute the sample proportions as follows:

$\hat p_{1}=\frac{80}{250}=0.32\\\\\hat p_{2}=\frac{40}{175}=0.23$

The critical value of <em>z</em> for 90% confidence interval is:

$z_{0.10/2}=z_{0.05}=1.645$

Compute a 90% confidence interval for the difference between the proportions of women in these two fields of engineering as follows:

$CI=(\hat p_{1}-\hat p_{2})\pm z_{\alpha/2}\times\sqrt{\frac{\hat p_{1}(1-\hat p_{1})}{n_{1}}+\frac{\hat p_{2}(1-\hat p_{2})}{n_{2}}}$

$=(0.32-0.23)\pm 1.645\times\sqrt{\frac{0.32(1-0.32)}{250}+\frac{0.23(1-0.23)}{175}}\\\\=0.09\pm 0.0714\\\\=(0.0186, 0.1614)\\\\\approx (0.02, 0.16)$

There will be no difference between the two proportions if the 90% confidence interval consists of 0.

But the 90% confidence interval does not consists of 0.

Thus, there is a significant difference between the two proportions.

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3 years ago

What is (2/3)^4 <br> does anybody know?

Sveta_85 [38]

Answer:

Step-by-step explanation:

<h2>hopes this helps. Mark as brainlest plz!</h2>

4 0

2 years ago

248 students went on a trip to the zoo. All 6 buses were filled and 8 students had to travel in cars. How many students were in

PIT_PIT [208]

40 students on each bus. 248 minus 8 equals 240. 240 divides by 6 equals 40.

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3 years ago

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15+c=17.50 in a real world situation,

Law Incorporation [45]

Answer: 2.5

Step-by-step explanation:

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3 years ago

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